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This content comes from Closed Captioning that was broadcast along with this program.

>>>good evening. it happened in an instant. it shook the ground around it. suddenly a huge area was levelled in
center city
,
philadelphia
. a building collapse that looked more like ana-i explosion. the first of the first responders arrived within two minutes. that's when the search got under way as rescuers followed voices beneath tons of
building materials
. it's where we begin tonight with nbc's kristen dahlgren at the scene.

>> reporter: witnesses describe a huge rumble and crash. [ sirensv ] and then the sounds of cries and moans from beneath the bricks and concrete. one man in his truck was stopped at a
red light
nearby.

>>all of the sudden you heard the bricks started falling at first. smoke and dust. next thing you know the pole came down
over the top
of my truck.

>>is some people were panicking, shaking real bad.

>>none of them were able to walk. they were bruised, maybe
broken bones
.

>> reporter: firefighters and
rescue workers
climbed through the debris, pulling 13 from the rubble. bruised and battered, but alive. they were taken to area hospitals with minor injuries. many of the victims were in the
salvation armythrift store
when the building next door, a sandwich shop and
apartment building
under demolition, came crashing through. this is what
market street
and 22nd looked like before. this is after.

>>what we actually have is a 1+g four-story property that collapsed onto a ? property which is the
salvation army
store.

>> reporter: news helicopters were ordered away from the building so any cries for help could be heard. aided by
search dogs
, rescuers had no idea how many they were looking for.

>>if there is
anyone else
in that structure, in that building, under that rubble, our folks will find them. they will not stop until they are assured by their own standards that we have completed our job and found anyone who might be there.

>> reporter: so the search here continues tonight. one woman was actually found alive after being trapped under the rubble for two hours. tonight
philadelphia
's mayor confirms another woman, a 35-year-old, brian, was found dead.